Prana Power Yoga

In the sweltering summer, some New Yorkers dive into Starbucks for an air-conditioned respite. But patrons of Prana Power Yoga—yet another new studio near Union Square—get their buzz from posing in a room with the heat turned up. The studio maintains the temperature at a toasty 95 degrees while instructors plunge yogis into a vigorous vinyasa flow. Bring a towel and an extra set of clothing.